CN102057702A - Method and system for providing an uplink structure and minimizing pilot signal overhead in a wireless communication network - Google Patents
Method and system for providing an uplink structure and minimizing pilot signal overhead in a wireless communication network Download PDFInfo
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- CN102057702A CN102057702A CN2009801209647A CN200980120964A CN102057702A CN 102057702 A CN102057702 A CN 102057702A CN 2009801209647 A CN2009801209647 A CN 2009801209647A CN 200980120964 A CN200980120964 A CN 200980120964A CN 102057702 A CN102057702 A CN 102057702A
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- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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Abstract
A method and system are provided having an uplink control structure and a pilot signal having minimal signal overhead for providing channel estimation and data demodulation in a wireless communication network. The uplink control structures enable mobile terminals to communicate with corresponding base stations to perform various functions including obtaining initial system access, submitting a bandwidth request, triggering a continuation of negotiated service, or providing a proposed allocation re-configuration header. A dedicated random access channel is provided to communicatively couple the base station and the mobile terminal so that the mobile terminal can select a random access signaling identification. A resource request is received at the base station to uplink resource information from the mobile terminal and an initial access information request is received from the mobile terminal to configure the base station connection. Pilot signals with varying density configurations are provided to include low density symbol patterns for multiple contiguous resource blocks and high density symbol patterns for single resource blocks.
Description
Technical field
The present invention relates to wireless communication field, relate more specifically to provide the method and system of up link control structure and pilot signal in cordless communication network, described pilot signal can use minimal-overhead that channel estimating and data demodulates are provided.
Background technology
Cordless communication network as cellular network, is operated by the resource that is shared between the portable terminal of operating in the communication network.As the part of the process of sharing, one or more control appliances pair system resource relevant with channel, code and other resource is distributed.The particular type of cordless communication network, for example OFDM (" OFDM ") network is used to support as those according to the high-speed service of IEEE 802.16 standards based on honeycomb.IEEE 802.16 standards are commonly called WiMAX or are called as WirelessMAN or air-interface standard sometimes.
The OFDM technology is used the method for channelizing and radio communication channel is divided into a plurality of subchannels that can be used simultaneously by a plurality of portable terminals.These subchannels are often disturbed, and these interference can cause data degradation.
This just needs a kind of method and system that is used to provide up link control structure and pilot signal, and described pilot signal is used in the uplink operation of minimum signal expense between from the portable terminal to the base station and obtained channel information.Existing system does not use the up link control structure.Frequency pilot sign is provided to a certain extent, and this frequency pilot sign is set in the fixed mode of determining in advance into the pre-selected resource block capacity.The up link control structure and the effective System and method for of pilot signal hereinafter are provided, and described pilot signal has density self-adapting and distribution design and is extendible to the different capabilities Resource Block.
Summary of the invention
The present invention is preferably provided in the method and system that is used to provide up link control structure and pilot signal in the cordless communication network, and this pilot signal uses minimal-overhead that channel estimating and data demodulates are provided.
Be provided at the method for up link control in the cordless communication network, wherein cordless communication network comprises at least one base station that is connected at least one portable terminal communicatedly.Special-purpose Random Access Channel is provided to connect base station and portable terminal communicatedly, thereby portable terminal can be selected the random access signaling sign.The resource request uplink that base station place receives is to the resource information from portable terminal, and the initial access information request that is received from portable terminal is used to configurating base station and connects.
The present invention also provides a kind of method that produces the low-density pilot-frequency pattern of symbol.Suppose that first Resource Block has first reference axis of definition time domain and second reference axis of definition frequency domain, this first Resource Block has the pre-pilot symbol patterns of determining, comprises the border frequency pilot sign.Suppose that second Resource Block has the three axes of definition time domain and the 4-coordinate axle of definition frequency domain, repeats the pre-definite pilot symbol patterns from first Resource Block to second Resource Block.First Resource Block and second Resource Block are connected first boundary line of setting up between first Resource Block and second Resource Block.The border frequency pilot sign is maintained in the first area of first Resource Block, and wherein said first area is positioned at an end relative with first boundary line along first reference axis.The border frequency pilot sign is maintained in the second area of second Resource Block, and wherein second area is positioned at an end relative with first boundary line along the 4-coordinate axle.The boundary of frequency pilot sign between first Resource Block and second Resource Block adjacent with first boundary line is deleted, and the spacing of remaining frequency pilot sign can be adjusted to provide the uniformly dispersing of frequency pilot sign between first area and second area.
The present invention also provides a kind of method that produces the high density pilot symbol patterns.Syndeton is provided, comprise first Resource Block, second Resource Block and information resources piece, this first Resource Block has first reference axis of definition time domain and second reference axis of definition frequency domain, this second Resource Block has the three axes of definition time domain and the 4-coordinate axle of definition frequency domain, this information resources piece has the 5th reference axis of definition time domain and the 6th reference axis of definition frequency domain, wherein, first boundary line is set up between first Resource Block and second Resource Block, and second boundary line is set up between second Resource Block and information resources piece.The pre-pilot symbol patterns of determining is provided in the syndeton, should pre-pilot symbol patterns of determining comprise the first border frequency pilot sign in the first area that is provided at first Resource Block and be provided at the second border frequency pilot sign in the second area of information resources piece, this first area is positioned at an end relative with first boundary line along first reference axis, and this second area is positioned at an end relative with second boundary line along the 5th reference axis.The information resources piece is deleted.The 3rd border frequency pilot sign is provided in the 3rd zone of second Resource Block, the 3rd zone is positioned at an end relative with first boundary line along three axes, and the spacing of frequency pilot sign can be adjusted to provide the uniformly dispersing of frequency pilot sign between first area and the 3rd zone.
Description of drawings
With reference to following specific descriptions also in conjunction with the accompanying drawings, more complete understanding of the present invention and thing followed advantage and characteristics will be more readily understood, wherein:
Fig. 1 is the sketch according to the typical cellular communication system of principles of construction of the present invention;
Fig. 2 is the sketch according to the exemplary base station of principles of construction of the present invention;
Fig. 3 is the sketch according to the typical portable terminal of principles of construction of the present invention;
Fig. 4 is the sketch according to the typical relay station of principles of construction of the present invention;
Fig. 5 is the logical table sketch according to the typical OFDM generator architecture of principles of construction of the present invention;
Fig. 6 is the logical table sketch according to the typical OFDM receiver architecture of principles of construction of the present invention;
Fig. 7 illustrates according to principle of the present invention, has the Resource Block of the uplink pilot design that is used for two generator systems;
Fig. 8 illustrates according to principle of the present invention, has the Resource Block of the uplink pilot design that is used for four generator systems;
Fig. 9 illustrates according to principle of the present invention, the flow chart of portable terminal access and uplink resource allocation.
Embodiment
At first, although some embodiment discusses under the situation according to the wireless network of operating with reference to IEEE 802.16 broadband wireless standard of incorporating into herein, the present invention is not restricted to this point, can be applied to other and comprise that those according in other broadband network of operating based on the system of OFDM (" OFDM "), comprise third generation partner collaborative project (" 3GPP ") and 3GPP2 evolution.Similarly, the present invention has more than the system that is limited to based on OFDM, can implement according to other systems technology, for example, CDMA.
With reference now to accompanying drawing,, wherein similarly reference identifier is represented similar elements, and the exemplary communications systems 10 that provides according to the principle of the invention has been provided among Fig. 1.Communication system 10 comprises the base station controller (" BSC ") 12 that can control radio communication in a plurality of honeycombs 14, and honeycomb is by relevant base station (" BS ") 16 services.In some configurations, each honeycomb further is divided into a plurality of sectors 18 or zone (not illustrating in the drawings).Usually, each base station 16 can both promote with move and/or portable terminal 20 between use communicating by letter that OFDM (" OFDM ") carries out, described portable terminal is arranged in the honeycomb 14 relevant with corresponding base station 16.The mobile meeting of the portable terminal 20 relevant with base station 16 causes a large amount of fluctuations in the channel circumstance.As shown in the figure, base station 16 may comprise the space diversity of a plurality of antennas to be provided for communicating by letter with portable terminal 20.In some configurations, relay station 22 helps communicating by letter between base station 16 and the portable terminal 20.Portable terminal 20 can switch to another honeycomb 14, sector 18, zone (not illustrating in the drawings), base station 16 or relay station 22 from arbitrary honeycomb 14, sector 18, zone (not illustrating in the drawings), base station 16 or relay station 22.In some configurations, communicate by letter each other by backhaul network 24 and communicate with another network (as core network or internet, the two does not all illustrate in the drawings) in base station 16.Do not need base station controller 12 in some configurations.
With reference to figure 2, be illustrated as the example of base station 16.It for example is base control 26, baseband processor 28, radiating circuit 30, receiving circuit 32, many antennas 34a, 34b and the network interface 36 of CPU that base station 16 generally includes.Receiving circuit 32 receives radio frequency signals from the beared information of one or more long-range generators that provided by portable terminal 20 (shown in Figure 3) and relay station 22 (shown in Figure 4) by reception antenna 34a.Low noise amplifier and filter (not illustrating in the drawings) can cooperate in order to amplify and to remove broad-band interference in the pending signal.Centre or baseband frequency signal that down-conversion and digitizer (not illustrating in the drawings) downconvert to filtered received signal to be digitized into one or more digital streams.
Aspect emission, baseband processor 28 is received in the digitalized data that base control 26 is controlled automatic network interface 36, and described data may be represented audio frequency, data or control information, and 28 pairs of described data of baseband processor are encoded in order to transmission.The data that are encoded are output to radiating circuit 30, and the data that are encoded are modulated by one or more carrier signal of tool expectation tranmitting frequency in radiating circuit 30.Power amplifier (not illustrating in the drawings) is amplified to the modulated carrier signal and is suitable for transmitting stage (level), and by matching network (not illustrating in the drawings) the modulated carrier signal is sent to transmitting antenna 34b.Modulation and the details of handling will be described hereinafter in more detail.
With reference to figure 3, be illustrated as the example of portable terminal 20.Be similar to base station 16, portable terminal 20 comprises it for example being mobile control system 38, baseband processor 40, radiating circuit 42, receiving circuit 44, many antennas 46a, 46b and the user interface circuit 48 of CPU.Receiving circuit 44 receives from the radio frequency signals of one or more base stations 16 with the beared information of relay station 22 by reception antenna 46a.Low noise amplifier and filter (not illustrating in the drawings) can cooperate in order to amplify and to remove the broad-band interference of pending signal.Centre or baseband frequency signal that down-conversion and digitizer (not illustrating in the drawings) make filtered received signal downconvert to be digitized into one or more digital streams.
For the emission aspect, the digitalized data that baseband processor 40 receives from mobile control system 38, these data may be represented audio frequency, data or control information, and 40 pairs of data of baseband processor are encoded and are used for transmission.The data that are encoded are output to radiating circuit 42, and the data that are encoded are modulated to the one or more carrier signals that are positioned at expectation tranmitting frequency place with modulator in transmission circuit.Power amplifier (not illustrating in the drawings) is amplified to the modulated carrier signal and is suitable for transmitting stage (level), and by matching network (not illustrating in the drawings) the modulated carrier signal is sent to transmitting antenna 46b.Various modulation known to those of skill in the art and treatment technology can be used to carry out between portable terminal and the base station or directly or the signal transmission by relay station 22.
In the OFDM modulation, transport tape is divided into the carrier wave of a plurality of quadratures.According to numerical data to be transmitted each carrier wave is modulated.Because OFDM is divided into a plurality of carrier waves with transmission band, so the bandwidth of each carrier wave reduces and the modulating time of each carrier wave increases.Because a plurality of carrier waves are by parallel transmission, the transfer rate of numerical data on any known carrier wave or symbol is lower than the situation of using single carrier wave.
The OFDM modulation is operated information and executing invert fast fourier transformation to be launched (" IFFT ").For demodulation, carry out fast fourier transform (" FFT ") operation to received signal and just can recover emission information.In the practical operation, IFFT and FFT are corresponding to realize inverse discrete Fourier transformer inverse-discrete (" IDFT ") and discrete Fourier transform (DFT) (" DFT ") by Digital Signal Processing.Correspondingly, the characteristics of OFDM modulation signatureization are: a plurality of frequency bands in transmission channel produce quadrature carrier.Modulated signals is a digital signal, has low relatively transfer rate and can be positioned at its frequency band separately.Indivedual carrier waves are not directly modulated by digital signal.On the contrary, all carrier waves are handled by IFFT immediately and are modulated.
In operation, OFDM preferably is used to 16 downlink transmission at least to portable terminal 20 from the base station.Each base station 16 is equipped with n transmitting antenna 34b (n＞=1), and each portable terminal 20 is equipped with m reception antenna 46a (m＞=1).It should be noted that each antenna can be used to adopt appropriate duplexer (delpexer) or switch to receive and launches, and such mark just for the sake of clarity.
When relay station 22 is used, OFDM preferably be used to from the base station 16 to relay station 22 and from relay station 22 to portable terminal 20 downlink transmission.
With reference to figure 4, be illustrated as the example of relay station 22.Be similar to base station 16 and portable terminal 20, relay station 22 comprises it for example being relay and control system 50, baseband processor 52, radiating circuit 54, receiving circuit 56, many antennas 58a, 58b and the repeat circuit 60 of CPU.Repeat circuit 60 makes relay station 22 help the communication between base station 16 and the portable terminal 20.Receiving circuit 56 is by the radio frequency signals of reception antenna 58a reception from the beared information of one or more base stations 16 and portable terminal 20.Low noise amplifier and filter (not illustrating in the drawings) can cooperate the broad-band interference that is used to amplify and remove pending signal.Centre or baseband frequency signal that down-conversion and digitizer (not illustrating in the drawings) make filtered received signal downconvert to be digitized into one or more digital streams.
For emission, the digitalized data that baseband processor 52 receives from relay and control system 50, these data may be represented audio frequency, data or control information, and 52 pairs of data of baseband processor are encoded in order to transmission.The data that are encoded are output to radiating circuit 54, and the data that are encoded are modulated to the one or more carrier signals that are positioned at expectation tranmitting frequency place with modulator in radiating circuit 54.Power amplifier (not illustrating in the drawings) is amplified to the modulated carrier signal and is suitable for transmitting stage (level), and by matching network (not illustrating in the drawings) modulated carrier signal is sent to transmitting antenna 58b.Available various modulation of those skilled in the art and treatment technology are used between portable terminal 20 and the base station 16 as signal transmission above-mentioned description or that directly or indirectly pass through relay station 22.
With reference to figure 5, provide the logical table of OFDM transmission structure.At first, base station controller 12 (see figure 1)s to the data of each portable terminal 20, or directly or by means of relay station 22, send to base station 16 with scheduled transmission.Base station 16 may use the channel quality indication (" CQIs ") relevant with portable terminal 20 that the data that are used to transmit are dispatched, and suitable decoding and the modulation of selecting to be used for the transmitting and scheduling data.CQIs can directly obtain from portable terminal 20, perhaps can use portable terminal 20 to provide 16 places, base station of information to determine CQIs.No matter which kind of situation, the CQI of each portable terminal 20 is channel amplitude (or response) functions about OFDM frequency band intensity of variation.
At this moment, organize the symbol that bit is mapped to relevant position in expression amplitude and the PHASE DISTRIBUTION more.When expectation space diversification, 78 pairs of symbolic blocks of space time block code (" STC ") codimg logic circuit are handled, and this logical circuit can make the easier opposing that transmits disturb and easilier sentence decoded mode at portable terminal 20 and revise symbol.78 pairs of incoming symbols of STC codimg logic circuit are handled and n are provided the corresponding output of transmitting antenna 34b with base station 16.About as described in Fig. 2, base control 26 and/or baseband processor 28 provide mapping control signal to control the STC coding as above-mentioned.At this moment, suppose that n output symbol represent data to be launched and can be moved terminal 20 to recover.
To present embodiment, suppose that base station 16 has two transmitting antenna 32b (n=2) and STC codimg logic circuit 78 provides two output symbol streams.Correspondingly, each symbols streams of being exported by STC codimg logic circuit 78 is sent to corresponding IFFT processor 80a, 80b (being called IFFT 80 here in the lump), so be illustrated as separately for understanding easily.One of ordinary skill in the art will recognize that one or more processors can be combined separately or with other processing methods described herein, are used to the Digital Signal Processing that provides such.IFFT processor 80 is preferably operated so that inverse Fourier transform to be provided each symbol.The output of IFFT processor 80 provides the symbol in the time domain.Time-domain symbol is grouped into frame, and this frame inserts logical circuit 82a, 82b relevant (be called prefix here in the lump and insert circuit 82) with Cyclic Prefix (prefix-by-prefix).Each consequent signal is converted to intermediate frequency on the numeric field quilt, and converts analog signal to by corresponding digital up-conversion (" DUC ") and digital-to-analog (" D/A ") change-over circuit 84a, 84b (being called DUC+D/A 84 here in the lump).Consequent (simulation) signal is simultaneously modulated with expectation RF frequency, amplify, and is launched by RF circuit 86a, 86b (being called RF circuit 86 here in the lump) and antenna 34b.It should be noted that to the pilot signal of expection known to the portable terminal 16 and be dispersed in the subcarrier.The portable terminal 16 that hereinafter goes through uses pilot signal to be used for channel estimating.
With reference to figure 6, be illustrated as 20 pairs of receptions that transmit of portable terminal, described reception or for directly from base station 16 or by means of relay station 22.When arriving each antenna 46a place of portable terminal 20 when transmitting, corresponding RF circuit 88 is separated to be in harmonious proportion to each signal and is amplified.Distinct for simplicity, in two RX path only is shown among detailed description and the figure.90 pairs of analog to digital (A/D) transducer and lower frequency changer circuits are used for the analog signal of digital processing and carry out digitlization and down-conversion.Automatic gain control circuit (AGC) 92 can use consequent digitized signal to control based on the amplifier gain in the RF circuit 88 of received signal level (level).
Originally, digitized signal is offered sync logic 94, described sync logic comprises carries out buffer memory and calculates the thick sync logic 96 of two continuous OFDM intersymbol autocorrelations several OFDM symbols.Consequent and the corresponding time index of largest correlation result can be determined the fine synchronization search window, and fine synchronization logical circuit 98 these windows of use are determined the accurate frame initial position based on header.The output of fine synchronization logical circuit 98 can promote frame alignment logic circuit 100 to obtain frame.Appropriate frame is aimed at very important, thereby FFT subsequently is provided by the accurate conversion that can provide from the time domain to the frequency domain.The fine synchronization algorithm is the correlation between the local replica of the reception pilot signal of carrying based on header and known pilot data.In case aiming at, frame occurs, the prefix of OFDM symbol is removed logical circuit 102 by prefix and removes, and consequent sample is sent to frequency offset correction logical circuit 104, and this logical circuit can compensate the system frequency excursion that is caused by unmatched local oscillator in reflector and the receiver.Preferably, sync logic 94 comprises frequency shift (FS) and clock evaluate logic circuit 106, and this logical circuit helps assess influence to transmitting based on header, and described assessment is offered interrelated logic circuit 104 with appropriate processing OFDM symbol.
At this moment, the OFDM symbol in the time domain has been ready to use FFT processor logic 110 to be transformed into frequency domain.Consequently be sent to the frequency domain symbol in the processor logic 110.Processor logic 110 uses distribution pilot extraction logical circuit 112 to extract the distribution pilot signal, the channel estimating that uses channel estimating logical circuit 114 to determine based on the pilot signal of extracting, and use channel reconstructing logical circuit 116 that the channel response of all subcarriers is provided.In order to determine the channel response of each subcarrier, pilot signal is to be dispersed in a plurality of frequency pilot signs in the data symbol by the OFDM subcarrier with the known mode that has Time And Frequency simultaneously in essence.
Fig. 7 and Fig. 8 illustrate Resource Block (" RBs ") 70,70a-70n, 80, the 80a-80n (hereinafter referred to as " RB 70,80 ") with uplink pilot design.RB 70,80 comprises the frequency pilot sign of arranging with according to embodiment of the invention pattern.RB is defined as the minimum unit of channelizing and is generally used for little transmitted in packets (VoIP).RB can be arranged to all size, as 12x6,18x6 and 6x4 and other.Basic channel unit (BCU) is the minimum unit that channelizing distributes.Pilot symbol patterns is arranged among the RB 70,80, comprises border pilot frequency mode, density self-adapting and allocation model.RB 70,80 comprises the transverse axis of express time and the longitudinal axis of expression frequency.Pilot symbol patterns is used to channel estimating, data demodulates and detection and other.The pilot symbol patterns and the frequency pilot sign that is distributed in the boundary of resource area that may comprise distribution in abutting connection with the pilot symbol patterns of resource area.
Fig. 7 and Fig. 8 illustrate a plurality of RB configurations with pilot symbol patterns of the different densities configuration that is used for two reflectors and four reflectors respectively.This pilot frequency character density and pilot symbol patterns can be provided with to hold different from resource capacity with time and frequency.The frequency pilot sign that the frequency pilot sign that the frequency pilot sign that the frequency pilot sign of first reflector is confirmed as 1, the second reflector is confirmed as 2, the three reflectors is confirmed as 3, the four reflectors is confirmed as 4.RB 70,80 comprises frequency pilot sign zone and data-signal zone.The present invention is intended to reduce by the zone of the zone that makes data-signal (for example, resource) maximization and minimizing frequency pilot sign the expense of RB 70,80.In addition, the uplink pilot design of diversity zone and regional area can be unified based on density self-adapting and distribution design pilot configuration.Pilot symbol patterns with different densities value can produce be used for varying number in abutting connection with RB 70,80.Pilot symbol patterns and density value can transmit and receive (MIMO) pattern based on the capacity of adjacency resource and many antennas and select.
According to Fig. 7 and Fig. 8 illustrated embodiment, pilot symbol patterns produces according to a plurality of different densities values in abutting connection with RB 70,80.Independence (stand alone) RB 70,80 with high density pilot symbol patterns can link together so that the low-density pilot-frequency pattern of symbol to be provided with other RB 70,80.Independent RB70,80 pilot symbol patterns can comprise and be distributed in boundary to form the frequency pilot sign of high density pilot symbol patterns.Independent RB pilot symbol patterns can expand to two pilot frequency modes that the RB 70,80 of low-density pilot-frequency pattern of symbol is provided.Two independent RB 70,80 or connect with frequency or in the mode of time.For reducing pilot symbol patterns density, redundant frequency pilot sign can be eliminated at 70,80 boundaries of two RB.Can adjust the spacing of frequency pilot sign in frequency and/or on the time so that the uniformly dispersing of frequency pilot sign to be provided.This method can be used for pilot signal patterns is extended to a plurality of RB 70,80.As adjacency RB70, when 80 quantity increases, the pilot frequency character density pattern of RB 70,80 can become the low-density pattern from high-density mode.Can on frequency and time orientation, adjust total frequency pilot sign spacing to keep less than predetermined maximum.
According to another embodiment of the present invention, the RB 70,80 of some adjacency can be assumed to be and comprise the low-density pilot-frequency pattern of symbol in the lump.In this case, the RB 70,80 of adjacency is convertible into the independent RB 70,80 with high density pilot symbol patterns.Frequency pilot sign can distribute equably in frequency with on the time, and the maximum pilot tone spacing that provides for N RBs (N＞3 usually) is provided.The border frequency pilot sign can distribute so that extrapolation minimizes in frequency with on the time.By keeping the pilot symbol patterns with border frequency pilot sign, N RB 70,80 can reduce to N-1 RB 70,80.The frequency pilot sign spacing can be adjusted to and scatter frequency pilot sign equably on frequency and time orientation.In this case, the pilot frequency character density of RBs 70,80 can become high-density mode from the low-density pattern.This process can continue still to keep high pilot frequency character density up to single RB 70,80.
Fig. 7 and Fig. 8 illustrate several pilot frequency character density patterns.More than the BCU of an adjacency, all can realize low-density pilot-frequency pattern of symbol (for a reflector, 3.1%＜density＜5.3%) more than the RBs of three adjacency or more than a subframe.Density pilot symbol patterns during the RBs of a BCU or three adjacency can realize (for a reflector, density-5.6%).Be less than three RBs and can realize high density pilot symbol patterns (6.3%＜density＜8.3%).The high density pilot symbol patterns can be used for, for example, and the VoIP transmission.The invention enables pilot symbol patterns on time and frequency, to adjust based on adjacency RBs 70,80 capacity.
Again with reference to figure 6, the frequency pilot sign that processor logic 110 was expected in the frequency pilot sign that receives and specific subcarrier in particular moment compares to determine the subcarrier signals response, and frequency pilot sign is launched in this subcarrier.Its possibility of result is inserted into to assess the remaining channel response that the subcarrier of frequency pilot sign is not provided.Channel response actual and that insert can be used to assess the total channel response, and this channel response comprises the channel response of the subcarrier in the OFDM channel.
The frequency domain symbol and the channel reconstruction information that obtain from the channel response of each RX path can offer STC decoder 118, and this decoder all provides STC decoding to recover the emission symbol to two kinds of RX path.When each corresponding frequency domain symbol was handled, channel reconstruction information offered STC decoder 118 fully to remove the influence of transmission channel with equalization information.
Use symbol deinterleaver logical circuit 120 will be resumed symbol and put back in order, described symbol deinterleaver logical circuit 120 is corresponding with the symbol interleaver logic circuit 76 of base station 16 reflectors.Use is separated mapping logic circuit 122 with the deinterleaver symbol demodulation or separate and be mapped to corresponding bit stream.Use 124 pairs of bits of bit deinterleaver logical circuit to carry out deinterleaving, this bit deinterleaver logical circuit 124 is corresponding with the bit interleaver logic 72 of base station 16 transmitter structures.The deinterleaving bit by speed separate match logic circuitry 126 handle and be delivered to channel decoding logical circuit 128 with recover initial scrambler data and CRC check and.Correspondingly, CRC logical circuit 130 is CRC check and removing, verification scrambler data in a conventional manner, and the scrambler data are offered descrambling code logical circuit 132 be used to use known base station descrambling code code to come descrambling code, to recover original transmitted data 134.
When restore data 134, CQI 136 or the information that 16 places fully produce CQI in the base station are at least determined by channel variation analysis logic circuit 138 and are launched into base station 16.As above indicate, CQI134 can be the function of Carrier interference ratio (" CIR ") 140, can also be the function of channel response intensity of variation during by each sub-carrier in the OFDM frequency band.For this embodiment, be used for launching the channel gain of each subcarrier of the OFDM frequency band of information, compare with respect to another, thus the degree that channel gain changes when determining to pass the OFDM frequency band.Although there are a lot of technology to can be used for recording the degree of variation, each subcarrier that is used for launching the OFDM frequency band of information only comes the standard that departs from of calculating channel gain with a technology.
According to an embodiment, the invention provides the up link control structure that makes the ofdm system that portable terminal 20 can communicate with base station 16.Control structure comprises uplink acknowledgements (UL ACK) channel and Dedicated Control Channel, in order to feedback information, and described information such as channel quality indication (CQI) information, pre-coding matrix index (PMI) information, arrangement information and other information.According to an embodiment, portable terminal 20 can use the UL ack channel to be used for initially inserting ofdm system, is used for bandwidth request to cause continuing of protocol service; Be used to reconfigure suggestion distribution and other purposes of header.
The resource of fixed qty can be assigned to be used for the UL ack channel.One group of ack channel is defined and is used for all single distribution, and independent one group of ack channel is defined and is used for set of dispense.The ack channel that is used for given transmitted in packets is determined by the number of partitions (partition number) and layer.Ack signal is by several ACK subregions (tiles) transmission, and the ACK subregion is defined as the audio frequency or the subcarrier of one group of adjacency.The ack signal value can be determined by non-coherent detection or coherent detection.Quadrature scatters code can be used to multiplexing a plurality of ack signals on same ACK subregion.
Up link (" UL ") control channel structural support is used for the UL ack channel of single distribution and set of dispense simultaneously.UL control channel structure also supports to be used for a plurality of ACKs of emission different grouping on same resource, as in many code words MIMO (" MCW-MIMO ") or multiuser MIMO (" MU-MIMO ").The UL control channel is frequency selection scheduling and precoding also, is included as simple variation distribution feedback is provided.
The resource of fixed qty can be distributed and is used for the UL Dedicated Control Channel.Resource can be divided into UL control subregion, and the number of partitions of wherein distributing to the user depends on requested feedback quantity.Assigned sections can be by being interspersed among in the frequency band to obtain frequency diverse.The UL control information is carried out CRC protection and scrambler by user ID.The content of this information can change each feedback instances and hold as this class drive controlling information of broadband request.
UL inserts (" RA ") channel at random and can provide and make the user be able to connecting system at first by one in several physics control structures.According to an embodiment, the UL Random Access Channel is the resource of appointment.The UL Random Access Channel can be the channel based on contention of a plurality of portable terminal 20 request access/bandwidth.The resource of appointment can be distributed in these and insert request.Inserting request can be propagated with the resource of bandwidth request or repeated by ad hoc being used for inserting at random.If can obtain a plurality of possibilities, then mobile radio station 20 can be selected from a sequence and position randomly.
According to an embodiment, portable terminal 20 can be selected one randomly from L sequence, crosses over N RBs 70,80 for one in the described L sequence.Selectively, sequence length L can be selected as complete sequence is limited in the RB 70,80.Be limited among the RB 70,80 by propagating sequence, that when RB 70,80 be actually frequency-flat comprise the audio frequency of adjacency physically as RB the time, this is propagated sequence and keeps quadrature.Propagating sequence can be repeated in each RB 70,80 to obtain diversity.
If many resources are allocated for up link control, resource can be divided into M the T/F piece that is used for inserting at random.In this case, the quantity of the independent code/resource of each subframe is LM, and wherein, the value of M is dynamically determined by base station 16.In certain embodiments, the subframe (perhaps being defined as F frame group) in the superframe is also selected at random, and wherein, the quantity of the independently code/resource/subframe of every superframe is defined as LMF.
Another physics control structure comprises that covering access at random with the UL control signal asks.Except that other up link control, the request of access can be propagated and repeated as the resource of this class up link control of CQI by being used for.If in the time of can obtaining a plurality of possibility, portable terminal 20 can be selected from a sequence and position randomly.For example, portable terminal 20 selection from L sequence at random, wherein L is less than or equal to the capacity of RB.Be restricted among the RB 70,80 by propagating sequence, when RB70,80 was actually frequency-flat such as RB and comprises the audio frequency of physical abutment, this was propagated sequence and keeps quadrature.Fully repeat on the sequence of length L each in N RBs 70,80.The coherent combination that each sequence repeats can improve the detection at 16 places, base station.
When covering RA request and UL signal, if many resources are assigned to up link control, then this resource can be divided into M T/F piece that is used for inserting at random.The quantity of the independently code/resource of every subframe is LM.Numerical value of N and M are dynamically determined by base station 16.In certain embodiments, the subframe (perhaps being defined as F frame group) in the superframe is also selected at random.In certain embodiments, sequence is crossed over N RBs 70,80.Sequence length under these situations is LN, and the quantity of the independently code of every subframe or resource is LNM.
In certain embodiments, L the propagation sequence set that sequence is a quadrature, wherein the L-sequence can be divided into the indication of two classes.The first kind comprises that the system of the portable terminal ID with prior appointment inserts request, and second class comprises that the system of the portable terminal ID with appointment inserts request.If portable terminal 20 is provided the system of being linked into, down link (DL) control section inserts allowance can be by sequence/Resource Block ID scrambler.Base station 16 can be attempted interference eliminated and be come to remove the RA channel from UL control.
Another physics control structure comprises the RA channel is covered on the UL resource of broadband.Request is propagated by the UL channel or is repeated, and may pass through whole broadband.If can obtain a plurality of possibilities, user's access operation at random sequence and position that can to distribute to a length be L then.
Random Access Channel can be specified one to be used to use the sequence of length as L by all users.Total resources NT can be divided into M T/F piece that is used for inserting at random.Access sequence by propagating and repeating, can be crossed over NT/M=N RB ' s (for example N=3).Portable terminal 20 is selected in M randomly, and wherein the quantity of the independent resource of every subframe is M.The subframe of request is still selected randomly.
The sequence of Jie Ruing may be the propagation sequence set of quadrature at random.Two sequences may be defined as the indication of two classes.The first kind comprises that the system of the portable terminal ID with prior appointment inserts request, and second class comprises that the system of the portable terminal ID with appointment inserts request.If portable terminal 20 is provided the system of being linked into, down link (DL) control section inserts allowance can be by sequence/Resource Block ID scrambler.Base station 16 can be attempted interference eliminated and be come to remove the RA channel from UL control.When hypothesis RA was launched or is not launched, base station 16 all can attempt UL control and traffic transmission are deciphered.
In case portable terminal 20 connecting systems, portable terminal 20 can ask resource on the UL to transmit information to base station 16.The present invention provides the selection of several execution UL resource request for portable terminal 20.First transmission parameters can be determined that this parameter can be set to based on consulting the default of performance by the broadband request, and this capable setting parameter is that perhaps this parameter is set by alternate manner based on the configuration before upgrading.Portable terminal 20 can change allocation of parameters, the additional information that reconfigures that active data is encoded when comprising with next transmitted in packets of beginning.This has utilized the advantage of the HARQ of control information.
According to an embodiment, information sets (field) can append in the packet before coding.When packet after 16 places, base station are decoded, header is positioned and determines whether that the information that reconfigures of adding has been added to and has in the packets of information of reconfiguring.The header operation can comprise 2 bit header information sets, and this information sets is represented the existence and the COS of the information that reconfigures.For example, ' 00 ' can represent not have configuration change and nothing reconfigures information; ' 01 ' can represent not have configuration change, do not have the information that reconfigures and provide service for another grouping; The information that reconfigures of Class1 can be represented to have added in ' 10 '; And the information that reconfigures of type 2 can have been represented to add in ' 11 '.
Except that other transmission parameter, the information of reconfiguring can comprise existing distribution or the change that distributes in the future, also comprise the different MIMO pattern of mobile power header space, function renewal, request, request mobile data deposit size different MCS indications, continue to distribute the UL resource up to indication, the resource capacity explanation of data reserve when empty, postpone the request of request, quality services (" QoS ") and additional service/resource.
During response Random Access Channel signal, the user also can be distributed to one or more user ID in base station 16, portable terminal is used to provide the initial UL resource of information, capabilities of user devices, from the DL resource allocation request information of portable terminal and additional detail, as set of dispense, base station program and other parameter etc.Described assignment information may have user ID information.
16 signals that send to portable terminal 20 can use the user to discern base station 16 as the signaling ID option of selecting at random that RA selects from the base station.For example, if response during RA control channel usually in a certain mode by user's scrambler, then base station 16 will send the control information of the index scrambler of the signaling ID that is selected at random, as index of sequence, sequence location etc.
In another embodiment, some signaling IDs can keep for the user of distributing user IDs.For example, the user can carry out handover operation and may visit new serving sector.If the user ID of distribution is not provided, then the user can select from random access signaling IDs group.Perhaps, if the user has user ID, then the user can select from different signaling chooser groups.During response, do not provide the signaling of user ID to select if portable terminal 20 has sent indication, then base station 16 can send by the control information of RA signal index scrambler and comprise user ID.Perhaps, if portable terminal has sent the signaling selection that indication has user ID, then base station 16 can send by the control information of RA signal index scrambler and not have user ID.Portable terminal 20 can be indicated user ID in next UL transmission that is used for capabilities of user devices etc.
According to an embodiment, header and alternatively imformosome be added to first transmitted in packets.Perhaps, header and alternatively imformosome be added to first transmitted in packets and each N grouping afterwards, wherein N can be from 1 to infinite.The ACK/NAK that base station 16 can be portable terminal 20 and provide transmitted in packets reconfigures information with indication and is correctly received.
Between the allotment period of portable terminal 20, the user can embed header on the data packet transmission that detailed configuration is provided or reconfigures.The request that is used for the portable terminal 20 of UL resource can produce on the private resource in UL controls subregion.According to the pre-pattern of determining, these resource capacities can be different to different frames.This capacity is known at portable terminal 20 and 16 places, base station, then signaling configuration after be unwanted.
According to an embodiment, resource request can take the information sets of keeping for another information (CQI, ACK/NAK, precoder index etc.).The existence of request can be determined by UL control information type.Portable terminal 20 can be set at this type and comprise the information configuration that is used for the resource allocation space.Therefore, the capacity of this information can not change the constant volume really from subframe.The existence of solicited message group can be dynamic, but does not influence the pre-capacity of determining of user's UL control.Resource request can be encoded with other UL control data, thereby resource request can be in order to receiving reliably.
For giving fixed system, request may have various ways.In first embodiment, resource request can be single " ON/OFF " indication.The details of distributing can provide in reconfiguring information, maybe can learn from previous or default configuration.Perhaps, except that other distribution, resource request can also be an information, and wherein the details of Fen Peiing is shown, as postponing restriction, QoS, grouping deposit and resource size.The details of distributing can be able to provide in reconstruction information, maybe can learn from previous or default configuration.For example, resource can be determined by secondary propagation channel, the UL resource can be distributed by the RB piece that distributes, bandwidth request can be the 4-10 bit of indication QoS and the first transmission spectrum efficient or portable terminal 20 cache size, the broadband request can take the information sets of distributing for another order, as DL CQI feedback, perhaps the UL resource can be carried out coding with other UL control data of user, thereby resource request can be received reliably.
According to another embodiment, the user can distribute (for example, channel sequence or position) among the random access signaling IDs behind connecting system.Resource request can be used same sequence or channel configuration.When having the RA channel, the user also can divide the specific subframe that is used in the resource request condition.The signaling of distributing can be the unique identifier of user's resource request.In first example, signaling IDs group can be resource request and reserves and be not useable for the RA request.Sequence or the position distributed can be the unique identifiers of user's resource request.Can be user's assignment signalling IDs with identification bandwidth request or resource request.Perhaps, can be user's assignment signalling IDs from the close set of RA signaling IDs.Sequence can be by resource request ID scrambler with identification BW or resource request.The sequence, position or the scrambler that distribute can be the unique identifiers of user's resource request.Except that other the resource of configuration, can be a plurality of signaling IDs that the user divides the services that are used in different configurations, as VoIP and http traffic resource request.If the user has another mechanism that obtains resource request and the condition of resource request is frequent, then the user may be regardless of the signaling that is equipped with this mode transmission resource request.
According to another embodiment, UL bandwidth or resource request can be used the resource that constantly is determined.One or more RBs and a plurality of RBs can distribute provides diversity.UL bandwidth or resource can cover on the resource as traffic signal or control signal together with other the traffic.If the user has the mechanism of another resource request and the condition of request is frequent, the user may be regardless of the signaling that is equipped with this mode transmission resource request.The UL bandwidth and the resource request that are used for portable terminal 20 can comprise the 4-10 bit, have the initial information of the information sets that comprises qualification, as the QoS and the first transmission spectrum efficient or comprise the portable terminal cache size of CRC.The UL bandwidth request and the resource request that are used for portable terminal 20 are to have multifarious reliable signaling, have the interference eliminated at use 16 places in the base station.The user can be separated by the position of the sequence of RBs, subframe or distribution.About sequence, can be each user and distribute sequence blocks to be used.In other embodiments, can be the user distributes same sequence set to promote the detection at 16 places in the base station.Perhaps, can use as Zadoff-Chu or this class orthogonal sequence of Walsh sequence.The length of these sequences may be less than the length of RB.If N RBs can distribute to each resource request channel, then this can be repeated by all RBs.Perhaps, sequence can be propagated by N all RBs.
Perhaps, the ID of scrambler can offer and be used for the portable terminal 20 that UL rebuilds request.Receive the UL distribution of known type service at portable terminal 20 after, this service can be rebuild by single information.This information can be to rebuild the simple ON/OFF trigger (toggle) of the parameter with previous or existence.Can use the resource request service of rebuilding that this information is sent to last configuration parameter inserting the space at random.Can be portable terminal 20 distributes a plurality of information to switch (toggle) a plurality of services.The reconstruction parameter that is used for first transmission can be arranged to default value.
Fig. 9 illustrates access and the uplink resource allocation flow chart between portable terminal 20 and the base station 16.Use is selected sequence, portable terminal 20 to begin to insert randomly and is asked base station 16 (step S90).Permit and original allocation (step S92) for portable terminal 20 provides to insert base station 16.Portable terminal 20 receives the initial UL with user ID and resource allocation (UL and/or DL) and distributes (step S94).Portable terminal 20 proposes UL broadband request (step S95) to base station 16.Base station 16 provides UL resource allocation (step S96).Portable terminal 20 is carried out the UL transfer of data, comprises the continuation that reconfigures and serve (step S97) of service.If portable terminal 20 is moved to different honeycombs, then the UL service request of rebuilding can send to base station (step S98).
The present invention can realize in hardware, software or hardware and combination of software.Be suitable for carrying out the computing system of any kind of method described herein or other equipment, all be suitable for carrying out function described herein.
The typical combination of hardware and software can be the computer system that has one or more processing unit and be stored in the computer program in the memory media, and this memory media can be controlled computer system so that can carry out method described herein when being downloaded and carry out.The present invention can also be embedded in the computer program product.This computer program product comprises the characteristics that all can realize method described herein, and described computer program product can be carried out these methods in the time of in installing to computer system.The memory devices that memory media relates to any easy mistake or is difficult for losing.
One of ordinary skill in the art appreciates that the content that the present invention is not limited to special hereinbefore diagram and describes.In addition, it should be noted that institute's drawings attached is not pro rata if do not describe on the contrary.Various according to the above description modifications and variations are possible and do not deviate from scope and spirit of the present invention that scope and spirit of the present invention are only limited by following claim.
Claims (20)
1. method that the up link control in the cordless communication network is provided, described cordless communication network comprises that at least one is connected to the base station of at least one portable terminal communicatedly, described method comprises:
Provide special-purpose Random Access Channel to connect base station and portable terminal communicatedly;
Just opening portable terminal is to select the random access signaling sign;
Produce resource request to receive uplink resource information at least one place, base station from portable terminal; With
Reception connects with configurating base station from the initial access information request of at least one portable terminal.
2. method according to claim 1 is wherein selected random access signaling to identify on the transmitted in packets that is included in the communication from the portable terminal to the base station randomly and is embedded header.
3. method according to claim 2, wherein, the described header on the transmitted in packets is selected sequence length from single Resource Block.
4. method according to claim 2, wherein, the described header on the transmitted in packets is selected sequence length from several Resource Block.
5. method according to claim 1, wherein, uplink resource information comprises at least one in channel quality indication, the arrangement of pre-coding matrix exponential sum.
6. method according to claim 1, wherein, initial access information request comprise the continuation of bandwidth request, service request and the distribution of the header that reconfigures at least one.
7. method that produces the low-density pilot-frequency pattern of symbol, described method comprises:
First reference axis with definition time domain and first Resource Block that defines second reference axis of frequency domain are provided, and described first Resource Block has the pre-pilot symbol patterns of determining, comprises the border frequency pilot sign;
Three axes with definition time domain and second Resource Block that defines the 4-coordinate axle of frequency domain are provided;
Repeat the pre-pilot symbol patterns of determining from first Resource Block to second Resource Block;
Connect first Resource Block and second Resource Block to set up first boundary line between first Resource Block and second Resource Block;
The border frequency pilot sign is remained on the first area of first Resource Block, and wherein the first area is positioned at an end relative with first boundary line along first reference axis;
The border frequency pilot sign is remained on the second area of second Resource Block, and wherein second area is positioned at an end relative with first boundary line along the 4-coordinate axle;
Delete the frequency pilot sign in first Resource Block and second Resource Block adjacent with first boundary line; With
The spacing of adjusting the frequency pilot sign between first area and the second area is to provide the uniformly dispersing of frequency pilot sign.
8. method according to claim 7 further comprises:
The 5th reference axis with definition time domain and the information resources piece that defines the 6th reference axis of frequency domain are provided;
Repeat the pre-pilot symbol patterns of determining from first Resource Block to the information resources piece;
Connect second Resource Block and information resources piece to set up second boundary line between second Resource Block and the information resources piece;
The border frequency pilot sign is remained on the first area of first Resource Block;
The border frequency pilot sign is remained on the 3rd zone of information resources piece, and wherein the 3rd zone is positioned at an end relative with second boundary line along the 6th reference axis;
Deletion is positioned at the frequency pilot sign at place, second boundary line; With
The spacing of adjusting the frequency pilot sign between first area and the 3rd zone is to provide the uniformly dispersing of frequency pilot sign.
9. method according to claim 8, wherein to be formed capacity be to comprise at least a in 12x6 size, 18x6 size and the 3x4 size for first Resource Block, second Resource Block and information resources piece.
10. method according to claim 9, wherein first Resource Block, second Resource Block and information resources piece comprise and the relevant frequency pilot sign of reflector that inserts corresponding resource blocks.
11. method according to claim 8, wherein the pilot frequency character density at several Resource Block places reduces along with the interpolation of Resource Block.
12. method according to claim 8, wherein the connection resource piece comprises according to time domain and being connected with in the frequency domain at least one.
13. method according to claim 8, wherein the pilot frequency character density at several Resource Block places is basically in 3% to 8% scope.
14. a method that produces the high density pilot symbol patterns, described method comprises:
Syndeton is provided, described syndeton comprises first Resource Block, second Resource Block and information resources piece, described first Resource Block has first reference axis of definition time domain and second reference axis of definition frequency domain, described second Resource Block has the three axes of definition time domain and the 4-coordinate axle of definition frequency domain, described information resources piece has the 5th reference axis of definition time domain and the 6th reference axis of definition frequency domain, wherein, first boundary line is set up between first Resource Block and second Resource Block, and second boundary line is set up between second Resource Block and information resources piece;
The pilot symbol patterns of determining in advance is provided in the syndeton, the pre-pilot symbol patterns of determining comprises the first border frequency pilot sign in the first area that is provided at first Resource Block and is provided at the second border frequency pilot sign in the second area of information resources piece, described first area is positioned at an end relative with first boundary line along first reference axis, and described second area is positioned at an end relative with second boundary line along the 5th reference axis;
Deletion information resources piece;
The 3rd border frequency pilot sign is provided in the 3rd zone of second Resource Block, and described second Resource Block is positioned at an end relative with first boundary line along three axes; With
The spacing of adjusting the frequency pilot sign between first area and the 3rd zone is to provide the uniformly dispersing of frequency pilot sign.
15. method according to claim 14 further comprises:
Delete second Resource Block;
The 4th border frequency pilot sign is provided in the 4th zone of first Resource Block, and described first Resource Block is positioned at an end relative with the first area along first reference axis; With
The spacing of adjusting the frequency pilot sign between first area and the 4th zone is to provide the uniformly dispersing of frequency pilot sign.
16. method according to claim 14, wherein to be formed capacity be to comprise at least a in 12x6 size, 18x6 size and the 3x4 size for first Resource Block, second Resource Block and information resources piece.
17. method according to claim 14, wherein first Resource Block, second Resource Block and information resources piece comprise and the relevant frequency pilot sign of reflector that inserts corresponding resource blocks.
18. method according to claim 14, wherein the pilot frequency character density at several Resource Block places increases along with removing of Resource Block.
19. method according to claim 14, wherein the connection resource piece comprises according to time domain and being connected with in the frequency domain at least one.
20. method according to claim 14, wherein the pilot frequency character density at several Resource Block places is basically in 3% to 8% scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510107389.4A CN104684096B (en) | 2008-04-21 | 2009-04-21 | The method and system of uplink control is provided within a wireless communication network |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4659608P | 2008-04-21 | 2008-04-21 | |
| US61/046,596 | 2008-04-21 | ||
| US5030308P | 2008-05-05 | 2008-05-05 | |
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